Question

Need help on Chemistry

Answer 1

You may find bellow the balanced chemical reactions.

Explanation:

To balance chemicals equation the number of atoms of each element  

entering the reaction have to be equal to the number of atoms of each  

element leaving the reaction, in order to conserve the mass.

2. Single displacement: Zn + 2 HCl → ZnCl₂ + H₂

3. Decomposition: NiCl₂ → Ni + Cl₂

4. Double displacement: 2 LiI + Pb(NO₃)₂ → PbI₂ + 2 LiNO₃

5. Double displacement: BaCl₂ + H₂SO₄ → BaSO₄ + 2 HCl

6. Single displacement: Cu + 2 AgNO₃ → Cu(NO₃)₂ + 2 Ag

7. Synthesis (combination): 2 Na + O₂ → 2 Na₂O

8. Solid mercury (II) oxide decomposes to form liquid mercury and oxygen.

2 HgO (s) → 2 Hg (l) + O₂ (g) (decomposition reaction)

9. A solution of zinc hydroxide reaction with phosphoric acid (H₃PO₄) to produce solid zinc phosphate and water.

3 Zn(OH)₂ + 2 H₃PO₄ → Zn₃(PO₄)₂ (s) + 6 H₂O (l) (double displacement reaction)

where:

(s) - solid

(l) - liquid

Learn more about:

types of chemical reactions

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